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Full text of "Handbook Of Chemical Engineering - I"

POWER GENERATION AND TRANSMISSION
75
In the above
/ = coefficient of friction =   [ 0.30 for leather belts on cast iron pulleys.
I 0.45 for leather belts on wood pulleys. [ 0.55 for leather belts on paper pulleys. a = arc of contact, degrees,
w = weight of belt material per cubic inch = 0.035 Ib. for leather, v = speed of belt, feet per second, preferably from 67 to 75, and t — working tension, pounds per square inch (300 for leather). The value of / is increased by dressings, dampness or pulleys with cork inserts. Recommended values of (Ti — Tz) are 35 for single leather, 50 for double leather, 22 Ib. per ply for canvas: all per inch of width.    Pulleys used with double leather belts should not be less than 12 in. diameter.
Shafting.—For large installations, it pays to calculate shafting sizes closely, considering both transmission and bending stresses.    The accompanying table
HORSEPOWER TRANSMITTED BY TURNED STEEL LINE SHAFTING
Diam. of shaft, in.	Number of revolutions per minute										
	100	125	150	175	200	225	250	275	300	400	500
4	71.0	89.0	107.0	125.0	142.0	160.0	178	196.0	213.0	284.0	356
434	85.0	107.0	128.0	149.0	170.0	192.0	213	234.0	256.0	341.0	426
4>£	102.0	127.0	152.0	178.0	203.0	228.0	253	278.0	305.0	405.0	507
42i	119.0	149.0	179.0	209.0	238.0	268.0	298	328.0	357.0	476.0	595
5	139.0	174.0	208.0	244.0	278.0	313.0	347	382.0	417.0	557.0	695
5Ji	161.0	201.0	242.0	281.0	322.0	362.0	403	443.0	483.0	644.0	805
5H	184.0	230.0	277.0	322.0	369.0	415.0	461	507.0	553.0	738.0	922
5H	211.0	264.0	317.0	369.0	422.0	475.0	528	580.0	633.0	844.0	1 , 055
6	240.0	300.0	360.0	419.0	480.0	540.0	600	660.0	720.0	960.0	1,200
6>4	271.0	339.0	407.0	473.0	542.0	610.0	678	74f>. 0	813.0	1,084.0	1 , 355
6>6	305.0	382.0	459.0	535.0	611.0	687.0	764	840. 0	917.0	,222.0	1 , 528
&H	341.0	427.0	513.0	598.0	682.0	767.0	853	938.0	1,023.0	, 364. 0	1 , 705
7	381.0	476.0	573.0	667.0	762.0	857.0	953	1,048.0	1,143.0	,524.0	1 , 905
7>i	423.0	529.0	636.0	742.0	847.0	953.0	1 , 059	1,264.0	1,270.0	,093. Oi2,110	
7H	468.0	586. 0	704.0	822.0	938.0	1,055.0	1,173	1,290.0	1,406.0	,875.02,34-1	
7*4	516.0	646.0	776.0	904.0	1,033.0	1,163.0	1,293	1,422.0	1,550.0	2,066.0	2 , 583
8	568.0	712.0	855.0	998.0	1, 138.0	1,280.0	1 , 423	1,565.0	1,707.0	2,275.0	2,844
8>2	681.0	853.0	1,025.0	1,197.0	1,364.0	1,535.0	1,707	1,878.0	2,047.0	2,728.013,411	
9	809.0	1,013.0	1,217.0	1,421.0	1,620.0	1,823.0	2,027	2,230.0	2,430.0	3,240.0	
9>2	951.0	1, 191.0	1,431.0	1,671.0	1,904.0	2,143.02,382		2,620.0	2,858.0		
10	1,111.0	1,388.0	1,666.0	1,944.0	2,222.0	2,500.0	2,778	3,055.0	3,333.0		
(From MARKS' Mechanical Engineers' Handbook*)
is a guide. Mill shafts run from 150 to 400 r.p.m. Cold-rolled shafting has the disadvantage of being apt to spring when key ways are cut. The maximum spacing of bearings in feet should be 10^ to 6d^ according as the shaft is bare or carries the usual number of pulleys, placed near bearings: d being the shaft diameter in inches. Hangers are obtainable in various "drops'7 for ceiling,